[docs] Add Elastic Agent doc changes for 7.9 (#20437)

* [docs] Add ingest management doc changes for 7.9

* Update Beats agent docs with other 7.9 changes

* Add copy of js/css to reduce dependencies

* Temporarily override release state

* Fix bug in platform selector

* Add changes from review

x-pack/elastic-agent/docs/elastic-agent-command-line.asciidoc

@@ -1,6 +1,10 @@
 [[elastic-agent-cmd-options]]
 [role="xpack"]
-= Command line options
+= {agent} command line options
+
+++++
+<titleabbrev>Command line options</titleabbrev>
+++++
 
 beta[]
 

x-pack/elastic-agent/docs/elastic-agent.asciidoc

@@ -1,3 +1,5 @@
+:release-state: released
+
 [[elastic-agent-installation-configuration]]
 [role="xpack"]
 
@@ -8,14 +10,15 @@ beta[]
 // tag::agent-install-intro[]
 {agent} is a single, unified agent that you can deploy to hosts or containers to
 collect data and send it to the {stack}. Behind the scenes, {agent} runs the
-{beats} shippers or Endpoint required for your configuration.
+{beats} shippers or Elastic Endpoint required for your configuration.
 // end::agent-install-intro[]
 
 To learn how to install, configure, and run your {agent}s, see:
 
 * <<elastic-agent-installation>>
 * <<run-elastic-agent>>
 * <<stop-elastic-agent>>
+* <<unenroll-elastic-agent>>
 * <<elastic-agent-cmd-options>>
 * <<elastic-agent-configuration>>
 
@@ -25,6 +28,8 @@ include::run-elastic-agent.asciidoc[leveloffset=+1]
 
 include::stop-elastic-agent.asciidoc[leveloffset=+1]
 
+include::unenroll-elastic-agent.asciidoc[leveloffset=+1]
+
 include::elastic-agent-command-line.asciidoc[leveloffset=+1]
 
 include::elastic-agent-configuration.asciidoc[leveloffset=+1]

x-pack/elastic-agent/docs/install-elastic-agent.asciidoc

@@ -4,82 +4,17 @@
 
 beta[]
 
-Download and install the Agent on each system you want to monitor.
-
-//TODO: Replace with tabbed panel when the code is stable. 
+Download and install {agent} on each system you want to monitor.
 
 // tag::install-elastic-agent[]
 
 To download and install {elastic-agent}, use the commands that work with your
 system:
 
-*mac:*
-
-ifeval::["{release-state}"=="unreleased"]
-
-Version {version} of {agent} has not yet been released.
-
-endif::[]
-
-ifeval::["{release-state}"!="unreleased"]
-
-["source","sh",subs="attributes"]
-----
-curl -L -O https://artifacts.elastic.co/downloads/beats/elastic-agent/elastic-agent-{version}-darwin-x86_64.tar.gz
-tar xzvf elastic-agent-{version}-darwin-x86_64.tar.gz
-----
-
-endif::[]
-
-*linux:*
-
-ifeval::["{release-state}"=="unreleased"]
-
-Version {version} of {agent} has not yet been released.
-
-endif::[]
-
-ifeval::["{release-state}"!="unreleased"]
-
-["source","sh",subs="attributes"]
-----
-curl -L -O https://artifacts.elastic.co/downloads/beats/elastic-agent/elastic-agent-{version}-linux-x86_64.tar.gz
-tar xzvf elastic-agent-{version}-linux-x86_64.tar.gz
-----
-
-endif::[]
-
-*win:*
-
-ifeval::["{release-state}"=="unreleased"]
-
-Version {version} of {agent} has not yet been released.
-
-endif::[]
-
-ifeval::["{release-state}"!="unreleased"]
-
-. Download the {agent} Windows zip file from the
-https://www.elastic.co/downloads/elastic-agent[downloads page].
-
-. Extract the contents of the zip file into `C:\Program Files`.
-
-. Rename the `elastic-agent-<version>-windows` directory to `Elastic-Agent`.
-
-. Open a PowerShell prompt as an Administrator (right-click the PowerShell icon and select *Run As Administrator*).
-
-. From the PowerShell prompt, run the following commands to install Filebeat as a
-Windows service:
-+
-[source,shell]
-----
-PS > cd 'C:\Program Files\Elastic-Agent'
-PS C:\Program Files\Elastic-Agent> .\install-service-elastic-agent.ps1
-----
-
-NOTE: If script execution is disabled on your system, you need to set the execution policy for the current session to allow the script to run. For example: `PowerShell.exe -ExecutionPolicy UnRestricted -File .\install-service-elastic-agent.ps1`.
-
-endif::[]
+include::{beats-repo-dir}/x-pack/elastic-agent/docs/tab-widgets/install-widget.asciidoc[]
 
 // end::install-elastic-agent[]
 
+// Add Javascript and CSS for tabbed panels
+include::tab-widgets/code.asciidoc[]
+

x-pack/elastic-agent/docs/run-elastic-agent.asciidoc

@@ -5,67 +5,62 @@
 beta[]
 
 {agent} runs in two modes: standalone or fleet. The two modes differ in how you
-configure and manage the Agent.
+configure and manage the agent.
 
 [discrete]
 [[fleet-mode]]
 == Run in {fleet} mode
 
-With _fleet mode_, you manage {agent} remotely. The Agent uses a trusted {kib}
-instance to retrieve configurations and report Agent events. This trusted {kib}
+With _fleet mode_, you manage {agent} remotely. The agent uses a trusted {kib}
+instance to retrieve configurations and report agent events. This trusted {kib}
 instance must have {ingest-manager} and {fleet} enabled.
 
 To create a trusted communication channel between {agent} and {kib}, enroll the
-Agent to {fleet}.
+agent to {fleet}.
 
 To enroll an {agent} to {fleet}:
 
-. Stop the Agent, if it's already running.
+. Stop {agent}, if it's already running.
 
-. Go the **{fleet}** tab in {ingest-manager}, and click **Enroll new agent** to
-generate a token. See <<ingest-management-getting-started>> for detailed steps.
+. In {ingest-manager}, select **{fleet}**, then click **Add agent** to
+get an enrollment token. See <<ingest-management-getting-started>> for
+detailed steps.
 
-. Enroll the Agent:
+. Change to the directory where {agent} is installed, and enroll the agent to
+{fleet}:
 +
-[source,shell]
-----
-./elastic-agent enroll http://localhost:5601 $token
-----
-+
-Where `$token` is an enrollment token acquired from {fleet}.
-
-//TODO: Add tabbed panels for platform-specific tabs (waiting for final design)
+--
+include::{beats-repo-dir}/x-pack/elastic-agent/docs/tab-widgets/enroll-widget.asciidoc[]
+--
 
-To start {agent}, run:
-
-// tag::run-agent[]
-[source,shell]
-----
-./elastic-agent run <1>
-----
-<1> On Windows, you must run {agent} under the SYSTEM account if you plan
-to use the {elastic-endpoint} integration.
-// end::run-agent[]
+. Run the agent:
++
+--
+include::{beats-repo-dir}/x-pack/elastic-agent/docs/tab-widgets/run-widget.asciidoc[]
+--
 
 [discrete]
 [[standalone-mode]]
 == Run in standalone mode (default)
 
-With _standalone mode_, you manually configure and manage the Agent locally.
-Each Agent is configured to be in standalone mode by default after installation.
+With _standalone mode_, you manually configure and manage {agent} locally on the
+system where the agent is installed. {agent} is configured to run in standalone
+mode by default unless you enroll it in {fleet}. 
 
 If {agent} is installed as an auto-starting service, it will run automatically
 when you restart your system.
 
 To start {agent} manually, run:
 
-include::run-elastic-agent.asciidoc[tag=run-agent]
+include::{beats-repo-dir}/x-pack/elastic-agent/docs/tab-widgets/run-standalone-widget.asciidoc[]
 
-If no configuration file is specified, {agent} uses the default configuration,
-`elastic-agent.yml`, which is located in the same directory as {agent}. Specify
-the `-c` flag to use a different configuration file.
+Use the `-c` flag to specify the configuration file. If no configuration file is
+specified, {agent} uses the default configuration, `elastic-agent.yml`, which is
+located in the same directory as {agent}.
 
 For configuration options, see <<elastic-agent-configuration>>.
 
 //<<elastic-agent-configuration-example,`elastic-agent_configuration_example.yml`>>
 
+// Add Javascript and CSS for tabbed panels
+include::tab-widgets/code.asciidoc[]

x-pack/elastic-agent/docs/stop-elastic-agent.asciidoc

@@ -5,37 +5,7 @@
 To stop {agent} and its related executables, stop the {agent} process. Use the
 commands that work for your system. 
 
-*Windows:*
+include::{beats-repo-dir}/x-pack/elastic-agent/docs/tab-widgets/stop-widget.asciidoc[]
 
-If you installed the Agent as a service, stop the service. If
-necessary, use Task Manager on Windows to stop {agent}. This will kill the
-{agent} process and any sub-processes it created (such as {beats}).
-
-*Linux or macOS:*
-
-Run the following command to get the ID of the `elastic-agent` process:
-
-[source,shell]
-----
-ps | grep elastic-agent
-----
-
-Then kill the process:
-
-[source,shell]
-----
-kill -9 PID
-----
-
-Where `PID` is the ID of the `elastic-agent` process.
-
-*Systemd:*
-
-The DEB and RPM packages include a service unit for Linux systems with systemd.
-On these systems, you can manage {agent} by using systemd commands. Use
-`systemctl` to stop the Agent:
-
-[source,shell]
-----
-systemctl stop elastic-agent
-----
+// Add Javascript and CSS for tabbed panels
+include::tab-widgets/code.asciidoc[]